Technical Archive

MB&F
Horological Machines 80.RTL.B

MB&F Horological Machines 80.RTL.B: strap made to measure on the watch at the Casati Milano atelier, by appointment.

Horological Machine N°8 HM8 Can-Am Red Gold

Technical Specifications

MB&F 80.RTL.B
Reference

80.RTL.B

Movement

MB&F caliber HM8 Minutes, Jumping Hours

The Heritage

The MB&F Horological Machine HM8 features the in-house HM8 caliber with jumping hours and minutes indication. The movement uses an unconventional display system that departs from traditional watchmaking canons. The 80.RTL.B reference is part of the Swiss brand's Horological Machines collection.
Made to Measure

The strap for this watch is made to measure

On the MB&F Horological Machines the bracelet is drawn as part of the case: no catalogue strap will fit. In the atelier we take the measurements on the watch itself and build the strap on the piece — that is the work of Casati Milano.

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FAQ

Can a standard leather strap be fitted to the MB&F Horological Machines 80.RTL.B?

No, the case lugs are proprietary and integrated into the watch's design: a commercial strap with straight bars will not fit. The solution is a bespoke strap constructed entirely to measure by the craftsman at <a href="/pages/casati-booking">Casati Milano</a>, who takes measurements during an atelier consultation and crafts a fully personalised piece.

How does the bespoke strap creation process work?

The craftsman examines the watch in the atelier, measures the width, thickness, and angle of the proprietary lugs, then constructs the strap according to these specifications. Every element—leather, finish, buckle—is chosen based on the character of the HM8 and the owner's preferences. It is an artisanal process requiring a personal consultation by appointment.

Which type of leather suits the character of the MB&F Horological Machines 80.RTL.B best?

Natural-tanned alligator with regular grain enhances the tension between the geometric rationality of the case and the biological organicity of the leather. Alternatively, a full-grain vegetable-tanned cowhide emphasises the industrial and timeless aspect of the piece. Dark tones—burgundy, midnight blue, slate grey—create visual contrast and amplify the sculptural dimension of the watch.

How long does an artisanal leather strap last?

A strap crafted with premium leather and sartorial techniques lasts decades with proper care. The quality of tanning, material thickness, and precision of stitching ensure resistance to daily wear. Over time, the leather develops a unique patina that dialogues elegantly with the ageing of the titanium or rose gold case.

Why is the HM8 Can-Am so different from traditional watches?

The movement is rotated 90 degrees from the conventional axis, allowing for jumping hours and 360-degree calibre visibility. The entire case architecture is conceived as a three-dimensional sculpture inspired by the radical Can-Am race cars of the 1970s: no compromise with convention, only radical form and visionary engineering.